Equity-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended		0 Months Ended
	Jun. 30, 2014 Program	Jun. 30, 2013	May 31, 2014 2013 Equity Plan [Member] Stock Options [Member]	May 31, 2014 2013 Equity Plan [Member] Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity-based long-term incentive programs	2
Stock granted under equity plan			2.0	23.3
Stock vesting date			Apr. 30, 2016	Apr. 30, 2015
Weighted-average exercise price of options granted	$ 0.75
Remaining weighted average expected in years	3 years
Equity compensation expense	$ 9	$ 2
Compensation expense offset by a decrease due to net share settlements	5	0
Future equity-based compensation expense	$ 44